Turquoise type in large old bolo?

I’m wondering if anyone might be able to identify the type of turquoise in this bolo? It is a large stone about 2-5/8 by 1-1/2. I’m also attaching a hallmark picture. Any information is appreciated. Many thanks

Always hard to pin down from a photo. It looks like easter blue to me. Also could be blue gem, second choice.

I though I had seen the hallmark before, but couldn’t find anything. It looks like the stone has a large deposit of quartz in the upper right corner? If that is true I think I would call this Kingman. Thanks for sharing.